Supporting netcoreapp3.0/netstandard2.1?

[saber-wang]

Unhandled exception. System.TypeLoadException: Could not load type 'Microsoft.Extensions.DependencyInjection.MvcJsonMvcCoreBuilderExtensions' from assembly 'Microsoft.AspNetCore.Mvc.Formatters.Json, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
at Ocelot.DependencyInjection.OcelotBuilder..ctor(IServiceCollection services, IConfiguration configurationRoot)
at Ocelot.DependencyInjection.ServiceCollectionExtensions.AddOcelot(IServiceCollection services, IConfiguration configuration)
at netcore.Gateway.Startup.ConfigureServices(IServiceCollection services) in D:\NET\xfCore\netcore.Gateway\netcore.Gateway\Startup.cs:line 66
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.g__Startup|0(IServiceCollection serviceCollection)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.b__0(IServiceCollection services)
at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.UseStartup(Type startupType, HostBuilderContext context, IServiceCollection services)
at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass12_0.b__0(HostBuilderContext context, IServiceCollection services)
at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
at Microsoft.Extensions.Hosting.HostBuilder.Build()

[thangchung]

I have got the same issue. I used Ocelot v13.8.0-alpha0010 with .NET Core netcoreapp3.0 template and .NET SDK v3.0.100-preview7-012821 on my machine. @TomPallister Could you tell us how to work-around or fix it?

[thangchung]

I have found the issue is because of .NET Core 3.x used the new json lib. The same issue at domaindrivendev/Swashbuckle.AspNetCore#1030

[saber-wang]

@thangchung Yes, just add netcoreapp 3.0 to the targetFramework,I compiled it myself for the time being.

[Mortana89]

I still see this issue with even changing the target framework of our application to netcoreapp 3.0

[saber-wang]

@Mortana89 You need to compile Ocelot yourself and modify incompatibilities，You can see #1025 .